Hi,
I tend to print off paperback ups for the alternates on my flight plan. I do have some extras that I carry anyway (for example - Manston, Shawbury, Birmingham, Cardiff, Manchester) I know that in reality if I have failiure of the MFD then I can fly onto my destination, If it's more serious (such as MFD not working plus smoke) then it's the nearest suitable airfield and on the balance of probabilities will be vectored in. I also have paper airways charts in my flight case.